dm: soc: Introduce UCLASS_SOC for SOC ID and attribute matching

Introduce UCLASS_SOC to be used for SOC identification and attribute
matching based on the SoC ID info. This allows drivers to be provided
for SoCs to retrieve SoC identifying information and also for matching
device attributes for selecting SoC specific data.

This is useful for other device drivers that may need different
parameters or quirks enabled depending on the specific device variant in
use.

Reviewed-by: Simon Glass <sjg@chromium.org>
Signed-off-by: Dave Gerlach <d-gerlach@ti.com>

1 files changed, 102 insertions, 0 deletions

diff --git a/drivers/soc/soc-uclass.c b/drivers/soc/soc-uclass.c
new file mode 100644
index 0000000000..c32d647864
--- /dev/null
+++ b/drivers/soc/soc-uclass.c
@@ -0,0 +1,102 @@
+// SPDX-License-Identifier: GPL-2.0+
+/*
+ * (C) Copyright 2020 - Texas Instruments Incorporated - http://www.ti.com/
+ *	Dave Gerlach <d-gerlach@ti.com>
+ */
+
+#include <common.h>
+#include <soc.h>
+#include <dm.h>
+#include <errno.h>
+#include <dm/lists.h>
+#include <dm/root.h>
+
+int soc_get(struct udevice **devp)
+{
+	return uclass_first_device_err(UCLASS_SOC, devp);
+}
+
+int soc_get_machine(struct udevice *dev, char *buf, int size)
+{
+	struct soc_ops *ops = soc_get_ops(dev);
+
+	if (!ops->get_machine)
+		return -ENOSYS;
+
+	return ops->get_machine(dev, buf, size);
+}
+
+int soc_get_family(struct udevice *dev, char *buf, int size)
+{
+	struct soc_ops *ops = soc_get_ops(dev);
+
+	if (!ops->get_family)
+		return -ENOSYS;
+
+	return ops->get_family(dev, buf, size);
+}
+
+int soc_get_revision(struct udevice *dev, char *buf, int size)
+{
+	struct soc_ops *ops = soc_get_ops(dev);
+
+	if (!ops->get_revision)
+		return -ENOSYS;
+
+	return ops->get_revision(dev, buf, size);
+}
+
+const struct soc_attr *
+soc_device_match(const struct soc_attr *matches)
+{
+	bool match;
+	struct udevice *soc;
+	char str[SOC_MAX_STR_SIZE];
+
+	if (!matches)
+		return NULL;
+
+	if (soc_get(&soc))
+		return NULL;
+
+	while (1) {
+		if (!(matches->machine || matches->family ||
+		      matches->revision))
+			break;
+
+		match = true;
+
+		if (matches->machine) {
+			if (!soc_get_machine(soc, str, SOC_MAX_STR_SIZE)) {
+				if (strcmp(matches->machine, str))
+					match = false;
+			}
+		}
+
+		if (matches->family) {
+			if (!soc_get_family(soc, str, SOC_MAX_STR_SIZE)) {
+				if (strcmp(matches->family, str))
+					match = false;
+			}
+		}
+
+		if (matches->revision) {
+			if (!soc_get_revision(soc, str, SOC_MAX_STR_SIZE)) {
+				if (strcmp(matches->revision, str))
+					match = false;
+			}
+		}
+
+		if (match)
+			return matches;
+
+		matches++;
+	}
+
+	return NULL;
+}
+
+UCLASS_DRIVER(soc) = {
+	.id		= UCLASS_SOC,
+	.name		= "soc",
+};